bugfix tests

WpfDesign.XamlDom/Project/XamlParser.cs

@@ -271,7 +271,7 @@ namespace ICSharpCode.WpfDesign.XamlDom
 				iSupportInitializeInstance.BeginInit();
 			}
 			
-			foreach (XmlAttribute attribute in element.Attributes) {
+			foreach (XmlAttribute attribute in element.Attributes.Cast<XmlAttribute>().ToList()) {
 				if (attribute.Value.StartsWith("clr-namespace", StringComparison.OrdinalIgnoreCase)) {
 					// the format is "clr-namespace:<Namespace here>;assembly=<Assembly name here>"
 					var clrNamespace = attribute.Value.Split(new[] {':', ';', '='});